package com.changgou.web.gateway.filter;

import com.changgou.web.gateway.service.AuthService;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthFilter  implements GlobalFilter, Ordered {

    private static final String LOGIN_URL="http://localhost:8001/api/oauth/toLogin";

    @Autowired
    private AuthService authService;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();//请求对象
        ServerHttpResponse response = exchange.getResponse();//响应对象
        //判断是不是登录请求
        String path = request.getURI().getPath();
        if ("/api/oauth/login".equals(path) || ! UrlFilter.hasAuthorize(path)){
            return chain.filter(exchange);
        }

        //在cookie中取jti
        String jti=authService.getJtiFromCookie(request);
      if (StringUtils.isEmpty(jti)){
          //拒绝访问
       /*   response.setStatusCode(HttpStatus.UNAUTHORIZED);
          return response.setComplete();*/
       //跳转登陆页面
          return this.toLoginPage(LOGIN_URL+"?FROM="+request.getURI().getPath(),exchange);
      }

        //在redis中取jwt
       String jwt= authService.getJwtFromRedis(jti);
      if (StringUtils.isEmpty(jwt)){
        /*  //拒绝访问
          response.setStatusCode(HttpStatus.UNAUTHORIZED);
          return response.setComplete();*/
          //跳转登陆页面
          return this.toLoginPage(LOGIN_URL,exchange);
      }

        //对请求增强  携带令牌信息
       request.mutate().header("Authorization","Bearer "+jwt);
        return chain.filter(exchange);
    }

    private Mono<Void> toLoginPage(String loginUrl, ServerWebExchange exchange) {
        ServerHttpResponse response = exchange.getResponse();
        response.setStatusCode(HttpStatus.SEE_OTHER);
        response.getHeaders().set("Location",loginUrl);
        return response.setComplete();
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
